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Proceedings Paper

The Hitomi (ASTRO-H) hard x-ray telescope (HXT): current status of calibration
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Paper Abstract

The Japanese X-ray Astronomy Satellite, Hitomi (ASTRO-H) carried two hard X-ray telescopes (HXT), covering the energy band from 5 keV to 80 keV. In the initial functional verification phase of the onboard instruments, G21.5-0.9 and Crab nebula were observed with HXT. The data of G21.5-0.9 observation indicated that the hard X-ray imaging system worked well. Detail calibration of the Hitomi HXTs was performed with the observation data of Crab nebula. We extracted X-ray images of the Crab pulsar excluding the nebular emission, and confirmed that the imaging performance in orbit was satisfied with the requirement of the HXT. The 8-80 keV Crab spectrum was well fitted with a power-law model with the absorbed column of NH=3×1021 cm-2 . The estimated photon index of 2.122±0.003 was consistent with previous results of Crab observation, while the observed 2-10 keV flux of 2.3×10-8 erg s-1 cm-2 was slightly larger than the previous observation. We note that there was discrepancy between the simulated and the measured effective area on ground. Thus, we introduced a fudge factor to reproduce the effective area obtained in the ground calibration. The fudge factor of HXTs are included in the latest calibration database of Hitomi.

Paper Details

Date Published: 29 August 2017
PDF: 8 pages
Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 103990R (29 August 2017); doi: 10.1117/12.2272844
Show Author Affiliations
Hisamitsu Awaki, Ehime Univ. (Japan)
Hironori Matsumoto, Nagoya Univ. (Japan)
Manabu Ishida, ISAS/JAXA (Japan)
Akihiro Furuzawa, Fujita Health Univ. (Japan)
Shigeo Yamauchi, Nara Women's Univ. (Japan)
Yoshitomo Maeda, ISAS/JAXA (Japan)
Hideyo Kunieda, Nagoya Univ. (Japan)
Yoshito Haba, Aichi Univ. of Education (Japan)
Takayuki Hayashi, Nagoya Univ. (Japan)
NASA Goddard Space Flight Ctr. (United States)
Ryo Iizuka, ISAS/JAXA (Japan)
Kazunori Ishibashi, Nagoya Univ. (Japan)
Ikuyuki Mitsuishi, Nagoya Univ. (Japan)
Takuya Miyazawa, Okinawa Institute of Science and Technology Graduate Univ. (Japan)
Hideyuki Mori, NASA Goddard Space Flight Ctr. (United States)
Takashi Okajima, NASA Goddard Space Flight Ctr. (United States)
Satoshi Sugita, Tokyo Institute of Technology (Japan)
Keisuke Tamura, Nagoya Univ. (Japan)
Yuzuru Tawara, Nagoya Univ. (Japan)
Tessei Yoshida, Ehime Univ. (Japan)


Published in SPIE Proceedings Vol. 10399:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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